diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 1d1611c..03aba31 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -42,7 +42,7 @@ jobs:
       # keyed on the cell list / fetch script so a change re-downloads. Lets the
       # bake reuse the same cells across runs.
       - name: Cache demo ENC cells
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ${{ runner.temp }}/demo-cells
           key: demo-cells-${{ hashFiles('scripts/fetch-demo-cells.sh', 'Makefile') }}
@@ -50,7 +50,7 @@ jobs:
       # Cache the S-52 PresLib "ECDIS Chart 1" source cells (the IHO draft zip is
       # fetched once and extracted), keyed on the fetch script so a change re-pulls.
       - name: Cache PresLib Chart 1 cells
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ${{ runner.temp }}/preslib-cells
           key: preslib-cells-${{ hashFiles('scripts/fetch-preslib-cells.sh') }}